<!DOCTYPE html>	 
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
  <head>
    <title>Test</title>
    <meta charset="UTF-8" />
  </head>
  <body>
    <h1>Test</h1>
    <epub-switch>
      <epub-case required-namespace="https://example.org"> oh my! </epub-case>
      <epub-default>
        <p>is this real?</p>
      </epub-default>
    </epub-switch>
  </body>
</html>
